Web Auth Customization (download datatype icon ???)

I recently Installed WLC 7.5 and began a basic Web Auth Customization. I performed my usual CLI commands to upload my image, when I found a new option, tranfer download datatype icon. I tried uploading a small image to see what it would change, and I didn't see anything in particular. Does anyone know what this changes? (No it did not change the Cisco logos anywhere in the gui, at least that I could see)

(Cisco Controller) >transfer download datatype ?

code Download an executable image to the system.config Download Configuration File.eapcacert Download a eap ca certificate to the system.eapdevcert Download a eap dev certificate to the system.icon Download an executable image to the system.image Download a web page logo to the system.ipseccacert Download a IPSec ca certificate to the system.ipsecdevcert Download a IPSec dev certificate to the system.login-banner Download controller login banner. (Only Text file supported: Max 1500 bytes & 18 lines, Non printable characters not supported)signature Download a signature file to the system.webadmincert Download a certificate for web administration to the system.webauthbundle Download a custom webauth bundle to the system.webauthcert Download a web certificate for web portal to the system.